Digital Ground Resistance Tester Model 4500
35
For example, if the reading is R = 15,
ρ
(resistivity) = 2
π
x R x A
A (distance between electrodes) = 450cm
ρ
= 6.28 x 15 x 450 = 42,390
Ω
-cm
Z
Y
X
X
v
TEST
RANGE
TEST CURRENT
2 10 50
2
20 200 2 20
R
B
X
Xv
Y
Z
A
A
A
DIGITAL GROUND
RESISTANCE
TESTER
MODEL 4500
Figure 19
A
A
A
A
A
A
Figure 20
